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    <h1>Reminder</h1>
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    <p>This software contains remind functionality, which can remind you of a todo item at a specific time.</p>
    <p>
        There are two types of reminder, one is a popup window on the screen, the other is email.
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    <p>
        There are three timing types, "At"(point in time), "Every"(interval), and "Before".
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	<p>
		A todo item can have more than one reminders.
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	<p>
        To config a todo item's reminders, right click on it to show its context menu, select the 'Set Reminder..." item, the configuration dialog will show up.
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    <p>
		In the dialog, click "Add reminder" to add a new reminder, click the "X" icon on the right of a reminder item to delete it.
    </p>
	<p>
		When timing type is "At", you can set the point in time directly through the drop-down time picker; When timing type is "Every" or "Before", a time span value is required.
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	<p>
		Time span value requires a specific format, that is Number+Unit, the following table lists supported units.
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	<p>
		<table>
		<tr>
		<td>M</td>
		<td>Month</td>
		</tr>
		<tr>
		<td>w</td>
		<td>Week</td>
		</tr>
		<tr>
		<td>d</td>
		<td>Day</td>
		</tr>
		<tr>
		<td>h</td>
		<td>Hour</td>
		</tr>
		<tr>
		<td>m</td>
		<td>Minute</td>
		</tr>
		<tr>
		<td>s</td>
		<td>Second</td>
		</tr>
		</table>
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	<p>
		A time span value can be composed of many Number+Unit groups. For example, 1d2h3m means one day and two hours and three minutes. Larger unit should be placed ahead, and groups are joined together without spaces.
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	<p>
		Reminder configurations are only configurations. To actually get reminded, you must start a standalone scheduler by this button:
		<div>
			<img src="image/btn_scheduler.png" alt=""/>
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	<p>
		The scheduler will remind you according to the reminders in the todo-lists it manages.
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